Kill Thexian searchers along both sides of the river between 'The Funeral Pyre' ( -971, 12, -731 ) /waypoint -971, 12, -731 and 'Headstone Walkway' ( -855, 59, -1340 ) /waypoint -855, 59, -1340 in Nektulos Forest for arcane signets. The signets are not an auto-update, they seem to be a common spawn.